Portable exhibit system



FIG. 1 is a perspective view of my design for a portable exhibit system showing my new design;

FIG. 2 is a rear elevational view thereof, shown on a slightly larger scale;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a side elevational view, shown on a larger scale. 

The ornamental design for a portable exhibit system, substantially as shown and described. 